Compound interest practice question for Railways, SSC. Review the correct answer and explanation, then continue with related practice below.
A sum becomes ₹6,600 in 2 years and ₹7,920 in 3 years at compound interest. What is the original principal?
एक धनराशि चक्रवृद्धि ब्याज पर 2 वर्षों में ₹6,600 और 3 वर्षों में ₹7,920 हो जाती है।
मूलधन कितना था?
Answer and explanation are free to read — no sign-in required.उत्तर और व्याख्या पढ़ने के लिए साइन-इन आवश्यक नहीं है।
Correct Answerसही उत्तर
C. ₹4,583.33
Explanationव्याख्या
5 Since the amount after 2 years is ₹6,600:
6)² = 6600 × 25
36 ≈ ₹4,583.33 Hence, the correct answer is ₹4,583.33.
Multiplying factor for 1 year: 1 वर्ष का गुणन कारक: = Amount₃ ÷ Amount₂ = 7920 ÷ 6600 = 6
चूँकि 2 वर्षों के बाद राशि ₹6,600 है: Principal × (6
5)² = 6600 Therefore, अतः, Principal = 6600 × (5
अतः सही उत्तर ₹4,583.33 है।
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